The plant tops appear to be too far away from the actual light tube (and I can't tell exactly where in that plastic cover the tube is). On top of that, I would also assume that the light is too weak. If it is an old fluorescent tube (more than three years old), it likely has weakened enough that you need a new one. The old tube can then be used for typical household uses as humans don't perceive the reduction in intensity as much as the plants.
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